forked from docs/doc-exports
Lu, Huayi
27019c2991
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
34 lines
2.5 KiB
HTML
34 lines
2.5 KiB
HTML
<a name="EN-US_TOPIC_0000001772696176"></a><a name="EN-US_TOPIC_0000001772696176"></a>
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<h1 class="topictitle1">COMMENT</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001772696176__en-us_topic_0000001658024870_en-us_topic_0000001436175729_en-us_topic_0214164629_p781310512108">In MySQL, <strong id="EN-US_TOPIC_0000001772696176__en-us_topic_0000001658024870_en-us_topic_0000001436175729_b124908102831644">COMMENT</strong> is a comment for a table. In GaussDB(DWS), this attribute can be used to modify table definition. During migration using DSC, additional table attribute information is added.</p>
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<p id="EN-US_TOPIC_0000001772696176__en-us_topic_0000001658024870_en-us_topic_0000001436175729_en-us_topic_0214164629_p659017367411"><strong id="EN-US_TOPIC_0000001772696176__en-us_topic_0000001658024870_en-us_topic_0000001436175729_en-us_topic_0214164629_b594718313141">Input</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001772696176__en-us_topic_0000001658024870_en-us_topic_0000001436175729_en-us_topic_0214164629_screen260412397186">CREATE TABLE `public`.`runoob_alter_test`(
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`dataType1` int NOT NULL AUTO_INCREMENT,
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`dataType2` FLOAT (10,2) COMMENT'dataType2 column',
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PRIMARY KEY(`dataType1`)
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) comment='table comment';
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ALTER TABLE `public`.`runoob_alter_test` COMMENT 'table comment after modification';
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ALTER TABLE `public`.`runoob_alter_test` ADD INDEX age_index(dataType2) COMMENT' index';</pre>
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<p id="EN-US_TOPIC_0000001772696176__en-us_topic_0000001658024870_en-us_topic_0000001436175729_en-us_topic_0214164629_p12114173518210"><strong id="EN-US_TOPIC_0000001772696176__en-us_topic_0000001658024870_en-us_topic_0000001436175729_en-us_topic_0214164629_b1871046151416">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001772696176__en-us_topic_0000001658024870_en-us_topic_0000001436175729_en-us_topic_0214164629_screen489081782010">CREATE TABLE "public"."runoob_alter_test"
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(
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"datatype1" SERIAL NOT NULL,
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"datatype2" REAL COMMENT 'dataType2 column',
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PRIMARY KEY ("datatype1")
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)
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WITH ( ORIENTATION = ROW, COMPRESSION = NO )
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NOCOMPRESS
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DISTRIBUTE BY HASH ("datatype1")
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COMMENT 'Comment of the table';
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ALTER TABLE `public`.`runoob_alter_test` COMMENT 'table comment after modification';
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CREATE INDEX "age_index" ON "public"."runoob_alter_test" ("dataType2") COMMENT' index';</pre>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0119.html">Table (Optional Parameters and Operations)</a></div>
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</div>
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</div>
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